Your post is really hard to read (formatting has been removed and everything runs together).
1. Do not use rational interpolation! Use linear or spline. Please see appNote available on Cadence Online Support
(support.cadence.com) "Using the nport in Spectre and SpectreRF Simulations"
In addition, please see the blog I wrote on nport settings: My Favorite nport Settings for Spectre and SpectreRF
2. You are getting the error message because you have multiple sets of s-parameters for the same frequency point.
I have also filed an enhancement CCR to improve our error message (currently, it's not very intuitive!) and also will be publishing Solution 11710310 on Cadence Online Support to alert other users who may run into this issue.
Glad it's working! Be sure to look at the post on recommended nport settings. The nport is a bit tricky.